Air or gas extractor for vehicles or buildings



' FeB, 11, W36. J. MUIRHEAD ET AL' AIR OR GAS EXTRACTOR FOR VEHICLES OR BUILDINGS Filed 001.. 28, 1935 Patented Feb. 11, i936 4' -UNITED STATES PATENT OFFICE AIR OR GAS EXTRACTOR FOR VEHICLES OR BUILDINGS James Muirhead and David Prain Muirhead, Glasgow, Scotland Application October 28, 1933, Serial No. 695,676 In Great Britain November 16,1932

8 Claims. (Cl. 98-120) This invention has reference to apparatus for an intervening cavity 24 which is blocked as and extracting air, smoke or other gases from buildwhere required to form a vertical uptake flue 26 ings, vehicles or other stationary or movable in the manner well known in building construcstructures, including the compartments of road tion. Surmounting one of these uptake flues we 5 or rail vehicles, the cabins or other compartments have shown one form of our extractor which comof ships or aircraft, domestic or industrial ventiprises a base plate 6 having an aperture therein lating flues, smoke stacks and outlet or uptake surrounded by an upstanding tubular shaft or fines and including the bonnets or cowlings and hollow trunk 1. The trunk 1 may be formed by scuttles of automobile and aircraft engines. The two parallel plates as shown or it may be of ob- I improved extractor can be utilized for example long, square, circular or other cross-section. A 1 upon the outlet ends of gas fire flues or upon the cowl is disposed over the trunk 1, the cowl havoutlet ends of flues built into the walls of building a pair of depending parallel baffles 8 which ings, or it can be used for ventilating a cavity preferably extend to a point at or just' below the wall, or to extract fumes from uptake flues leadlevel of the upp e of the trunk The p ing from enclosed compartments, such as kineof the cowl is shown in the form of a sliding cover 15 matograph operators cabins or other enclosed ll, being provided with inturned edges which enspaces from which air, steam, smoke or other gage beaded edges on parts lie of the cowl. The gases are to be removed. parts I I0 are preferably curved to form rain gut- A further object of the invention is to provide ters or melted snow channels. The sliding cover for the efiicient drainage of rain water or melted II has a handle to enable it to be drawn in 20 snow from the extractor, so that any liability either direction, so that a brush can be passed of flood water entering through the extractor through the flue 26 and trunk 1. The ends of into the building or other structure will be wholly the cowl are closed by end plates I 3 which extend or almost entirely eliminated. down to the base plate 6. At opposite sides of the 25 It is a further object of the invention to enable cowl are air channels 20 formed by outer sloping 5 the flue upon which the extractor is mounted to deflectors l8, the ends of the two deflectors being be cleaned without removal of the extractor from connected together by the end plates l3. As

the flue. clearly seen in Fig. 2, the base plate 6 is turned The extractor may be mounted upon or be uniover at 6a over the outer edges of the double wall tary with an upstanding tubular shaft or hollow and the sloping deflectors l8 are spaced a short 0 trunk which may be of oblong, square, circular, distance from the double wall and extended at oval or other cross-section. |8b down to about the lower edge of the turned- The extractor is provided with a movable secover part 6a of the base plate 6, so that an opention in its upper part so that, by moving the moving I9 is left along each side of the base of the able upper section, access can be had to the inteextractor. The openings l9 are relatively nar- 35 rior of the extractor and the tubular shaft or row and serve to discharge Water or melted snow trunk, so that a brush or the like can be passed which may collect in the channels 20 and the through the extractor when cleaning the uptake openings I 9 are shielded by the lower edges or exor flue upon which it is mounted. tensions I 8b of the sloping deflectors I 8, so as The invention will be hereinafter described to prevent wind currents from entering the ex- 40 w reference o t e co p ying drawing tractor through the openings l9. The base plate whereon the same reference characters are used 6 may Slope towards the openings 9 The down.

1 those employed in our Prior patent turned edges 6a serve to bind the extractor to the hon No. 1,728,001 to designate corresponding bricbwork of the wan g the drawing Fig 1 Shows an extractor The extractor may be built in between coping 45 cording to the present invention applied to the g g gf may ig i concoping of a cavity wall which forms an uptake 0m 0 6 ex S G ex raw or as flue. shown, being provided w1th rain channels It Fig. 2 is a vertical section through the extrac- W111 be undersmPd that m Such case the Jomjos 50 tor of Fig. 1. between the coping stones and the extractor W111 Fig. 3 is a perspective view of a half section be cemented made Water-tight in any W911- of a further form of extractor according to the known mannerinvention. It will also be apparent that one or more of the Figs. 1 and 2 show a hollow double wall 23 with extractors shown in Fig. 1 could be fitted to the 55 top of cavity parapet walls for ventilating the same.

The air, smoke or other gas rising in the trunk 1 passes over the top thereof into the channels 20, from which it is extracted by the suction of wind currents passing over the upper edges 18a of the deflectors [8.

Fig. 3 illustrates an extractor of the form shown in Figsv 1 and 2 having a cylindrical trunk I which can be fitted inside or around an uptake flue, such as an uptake flue leading from a gas fire or from a living room or workroom. In this case the base plate 6 is shown sloping towards the openings l9, and it will be manifest that the base plate 6 in Fig. 2 may slope downwards towards the openings I9.

We claim:

1. In a ventilator, a hollow shaft communicating with the space to be ventilated, a four sided outer structure comprising two end walls and two transverse upwardly and inwardly inclined deflector plates spaced from said shaft, a cowl above said shaft comprising baflies extending from end wall to end wall between said shaft and said deflectors, said bailles and deflectors forming two elongated slots terminating at the top in substantially parallel openings at opposite sides of said shaft, and base means extending outward from said shaft at a distance below said bafiles, but terminating just short of said deflectors to provide drainage slots between the base means and said deflectors.

2. A ventilator as described in claim 1, wherein the bottom edges of said bafiles terminate approximately at the level of the top of said shaft.

3. A ventilator as described in claim 1, wherein said cowl projects above the level of said open- 1ngs.

4. A ventilator as described in claim 1, wherein said hollow shaft extends from end wall to end wall and said base means comp-rises two plates extending from opposite sides of said shaft.

5. A ventilator as set forth in claim 1 wherein said deflectors extend below the level of the base means to provide protecting lips for the drainage slots.

6. A ventilator as set forth in claim 1 wherein said base means comprises two plates extending from opposite sides of said shaft and each provided at its outer edge with a downwardly projecting flange, and said deflectors extending below the level of said base means to provide protecting lips for the drainage slots formed between said flanges and the protecting lips.

'7. A ventilator as set forth in claim 1 wherein said cowl includes a movable closure at the top thereof whereby access may be had to the interior of the ventilator.

8. A ventilator as claimed in claim 1 wherein said base means slopes downwardly towards the drainage slots.

JAMES MUIRHEAD. DAVID PRAIN MUIRI-IEAD. 

